(define (fib n)
    (cond
        ((= n 0) 0)
        ((= n 1) 1)
        (else [+ (fib (- n 1)) 
                 (fib (- n 2))
            ])
    )
)
(pretty-print (fib 1))
(pretty-print (fib 2))
(pretty-print (fib 3))
(pretty-print (fib 4))
(pretty-print (fib 5))

